TLDR It's easy and free to retrieve a favicon with Google S2
Here’s what you need to do:
https://www.google.com/s2/favicons?domain=yourdomain.com
#replace yourdomain.com
This is how you use it:
<img src="https://www.google.com/s2/favicons?domain=dkkma.com" alt="DKKMA Agency">
Finally, this is how it looks like: